Weather Underground midday recap for Saturday, July 20, 2013.
A cold front over the Northeast produced showers and thunderstorms, and brought some relief to the heat across the Northeast and Upper Ohio River Valley on Saturday. A low pressure system spinning over eastern Canada created a cold front that slid over the Great Lakes and into the far Northeast. Showers and thunderstorms developed along this front, but it also brought slightly cooler temperatures to the region. South of this system, heat advisories remained in effect from Ohio through southern Maine. High temperatures remained from the mid-90s with heat index values over 100 degrees. Some storms turned severe along the cold front with reports of strong winds from Ohio through northern Vermont. To the south, moisture from the Gulf of Mexico maintained showers and thunderstorms across the Gulf states. Heavy rainfall developed in some of these areas, which increased threats of flooding. Heaviest rainfall was reported at Tallahassee, Florida with a mid-day total of 2.37 inches of rain.
In the Plains, shower and thunderstorm activity increased from the Dakotas through Kansas as a low pressure system moved eastward and off the Rockies. There was a slight chance that these storms would turn severe, but severe storms have not yet been reported. Further West, monsoonal moisture with warm afternoon temperatures allowed for more storms to develop across the Desert Southwest. These storms have a history of creating periods of heavy rain, thus, flood advisories have been issued for some areas from New Mexico through southern Nevada and southern California.
Temperatures in the Lower 48 states Saturday have ranged from a morning low of 37 degrees at West Yellowstone, Mont. to a midday high of 102 degrees at Lakehurst NAS, N.J.